Paper dish and method and apparatus of forming



Sept. 10, 1935. R. E. RUTLEDGE 2,014,297

PAPER DISH AND METHOD AND APPARATUS OF FORMING 2 Sheets-Sheet 1 Filed Jan. 20, 1934 Sept. 10, 1935. R. E. RUTLEDGE 2,014,297

PAPER DISH AND METHOD AND APPARATUS 0F FORMING Filed Jan. 20, 1934 2 Sheets-Sheet 2 ii I INVENTOR #am/ if iaf/w ATTORNEY$ Patented Sept. 10, 1935 PATENT OFFICE PAPER DISH AND METHOD AND APPARATUS F FORMING Robert E. Rutledge, Kalamazoo, Mieh., assignor to Sutherland Paper Company, Kalamazoo,

Application January 20, 1934, Serial No. 707,481

9 Claims.

The main objects of this invention are:

First, to provide an improved paper dish pressed from flat blanks which is very strong and rigid even when formed of light stock.

Second, to provide an improved paper dish having these advantages in which the strain upon the stock in forming is minimized.

Third, to provide an improved pressed paper dish which is very attractive in appearance.

Fourth, to provide a method of forming paper dishes embodying these advantages in which the stock in the formed dish is so disposed that the displacing strain thereon is minimized and the resultant dish is relatively. rigid and attractive in appearance.

Fifth, to provide an improved method offorming paper dishes in which the number of defectives produced is greatly reduced when compared to the defectives produced'by the methods now in vogue or commercially practiced.

Sixth, to provide an improved forming apparatus for dishes which enables a large output with a minimum of defective dishes.

Objects relating to details and economies of my invention will appear from the description to follow. The inventionis defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is illustrated in the accompanying drawings, in which:

' Fig. 1 is a fragmentary view mainly in section on a line corresponding to line l| of Figs. 2 and 3 of my improved machine or apparatus, a single unit being illustrated.

diFig. 2 is a fragmentary plan view of the female Fig. 3 is a fragmentary inverted view of the coacting male die. A

Fig. 4 is a plan view of the preferred embodiment of my invention.

Fig. 5 is an enlarged side or edge view.

Fig. 6 is an enlarged fragmentary section on line 6-6 of Figs. 4 and 5.

Fig. 7 is a plan view of a modified form of my invention, certain features only of the invention being shown in this embodiment.

Fig. 8 is an enlarged fragmentary view on line 8-8 of Fig. 7. A

My improved dish in its preferred embodiment shown in Figs. 4, 5, and 6, comprises a bottom I and side wall 2, the side wall having a downturned rim 3. The bottom 2 merges into the side wall with a reverse curve providing an annular bead 4 at the base of the side wall.

spaced inwardly tapered ribs 6 extending inwardly from this annular bead. These ribs merge or fade into the flat portion of the bottom. The side wall of thed ish has radial flute-like corrugations I which extendfrom the outer edge of the dish over its curved rim and to a point 7 indicated at 8 which is above but adjacent the bottom of the dish. These flute-like ribs or corrugations taper inwardly so that they fade out 10 at this point or zone 8. The resulting dish is very strong and rigid even when formed of relatively light stock and is attractive in appearance. The rim is stiffened so that the dish itself may be picked up by grasping the rim and side wall 15 I without the objectionable springing commonly incident to paper dishes.

A further advantage of these flute-like ribs in or yielding a the side wall andrim is that the dish may be bottom'features but the bottom conformation and the side wall conformation result in a very rigid 30 dish as well as one which is attractive in appearance.

In the embodiment of my invention shown in Figs. 7 and 8, the dish 9 has a polygonal rim l0,

- the side wall II and the rim being provided with 35,

corrugations or flutings l as in the preferred embodiment. The side wall of this embodiment is stepped at l2, the corrugations or flutings fading out at I3 adjacent the top of the step l2.

Other shapes may be satisfactorily produced 40 embodying certain of the features of my invention.

In Figs. 1, 2, and 3, I illustrate an apparatus or machine for forming my improved dishes, ll

representing the bed of the machine and I5 a reciprocating plunger. I have illustrated but a single unit but it will be understood that in practice a plurality of the die or forming units are provided. The machine consists of a female die I 6 and a coacting male die consisting of an inner member I! and an outer annular coacting member 33. The female die is supported on the die block IQ mounted on the bed of the machine, this being designedto receive a heating unit 20. The knockout 2| is provided with a disk-like head 22, the

2 face of which is flush with the bottom of the die.

A fragmentary plan view of the female die is.

shown in Fig. 2 and this consists'of the bottom portion 23 and the side wall portion 24 terminating in a down-curved rim portion 25. The rim and side wall portions have inwardly tapered corrugations or flutings "which merge into the side wall or flat portion thereof at a point adjacent but above the bottom. Only a portion of these flutings are shown but it will be understood that they extend around the entire circumference of the female die member.

The bottom is provided with a raised rib 21 which merges into the side wall with a reverse curve 28. This rib 21 is annular and forms the head I of the dish. The female die has inwardly tapered ribs 29 which form the ribs 6 of the dish. The inner male die member I! is formed to complement the female die member; that is, the parts thereof with which it coacts, the male die member having on its side wall portion inwardly tapered corrugations 30 complementing the inner portions of the corrugations 28 of the female die member. It has an annular groove 3| complementing the annular rib 21 of the female die member and radial grooves'32 complementing the radial ribs 29 of the female die member.

- The outer annular male die member 33 has a -rim formingportion 34 which complements the side wall portion of the male die member and coacts with the outer rim portion of the female die member. This outer die member 33 has corrugations 35 aligned yith the corrugations 25 of the male die member when the forming dies are closed. I

The die member' I1 is mounted upon the die block 38 which carries a heating element 31. The die member 33 is reciprocatingly mounted on the die block 36 and plunger l5, guide rods '33 being provided slidably engaging the ears 9 on the die member 33. Coiled springs 40 are arranged on these guide rodsand act to urge the die member forwardly, so that as the plunger is advanced, the

outer die member 33 will flrst engage the work 4 l,

as shown in Fig. 1,'which has been positioned upon the female diemember. The plunger, I5 is indicated in a slightly advanced position. As advancement continues, the die member 33 is yieldingly advanced to engage the work although it will draw in somewhat due to the center engaging weight 42 reciprocatingly disposed through the inner male die member and engaging the work, as shown in Fig. 1. As the dies are closed, the work is gradually conformed, the edges being drawn inwardly and the corrugations in .the side wall and rim formed and also the bottom conformationsproduced'.

The conforming stresses are so distributed that thereis no serious rupturing or breaking or folding of the stock, the flutings caring for the excess stock in the rim resulting from the dishing action of the dies. The resulting product is highly attractive in appearance and is very strong and rigid considering the stock employed.

in the art to embody or adaptmy improvements as may be desired. I Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A pressed paper dish comprising a bottom and-amoutwardly flaring side wallterminating in a down-turned curved rim, thejmttOm-merging into the side' wall with a reverse curve providing an upstanding annular bead in the bottom adjacent the side wall, the bottom also having a flat central portion and raised ribs tapering inwardly from the said bead and merging into the flat central portion, the side wall and rim having inwardly tapered flute-like radial corrugal5 tions extending to the edge of the rim and fading out at a point above but adjacent to the curve joining the side wall and bottom.

2. A pressed paper dish comprising a bottom and an outwardly flaring side wall terminating in a downwardly curved rim, the bottom having an upstanding annular bead adjacent the side wall, the bottom also having a flat central portion and raised ribs tapering inwardly from the said head and merging into the flat central portion, the side wall and rim having inwardly tapered flute-like radial con'ugations extending to the edge of the rim and fading out at a point above but adjacent to the bottom.

3. A pressed paper dish comprising a bottom and an outwardly flaring side wall terminating in a down-turned curved rim, the bottom merging into the side wall. with a reverse curve providing an upstanding annular bead in the bottom adjacent the side wall, the side wall and rim having inwardly tapered flute-like radial corrugations extending to the edge of the rim and fading out at a point above but adjacent .to the curve joining the side wall and bottom. a

4. A pressed paper dish comprising a bottom '40 and an outwardly flaring side wall terminating in a down-turned curved rim, the bottom having I an upstanding annular bead adjacent theside wall, the side wall and rim having inwardly tapered flute-like radial corrugations extending to 45 the edge of the rim and fading out at a point above but adjacent to the bottom.

5. A pressed paper dish comprising a bottom and an outwardly flaring side wall terminating 1 in a down-tinned curved rim, the side wall having inwardly tapered flute-like radial corrugations extending through and to the outer edge of the rim.

6. A'pressed paper dish having an outwardly flaring side wall terminating in a down-turned curved rim, the" side wall having radial flutings or corrugations extending through and to the outer edge of the rim and gradually tapering inwardly and merging into an unribbed zone adjacent,the bottom of the dish.

7. A pressed paper dish having an outwardly flaring uniformly corrugated side wall terminating in a down-turned curved rim, the radial flutings or corrugations extending through and to 1 the outer edge of the rim and gradually tapering inwardly. I

8. A pressed paper dish comprising abottom and an outwardly flaring side wall, the bottom merging into the side wall with a, reverse curve providing an upstanding annular bead in the bottom adjacent the side wall, the bottom also having a flat central portion with raised ribs tapering inwardly from the said bead and merging-into the fiat centralportion. I5

9. A dish comprising a bottom and an outwardand merging into the flat central portion, the aide 1y flaring side wall terminating in a down-turned wan and rim having inwardly tapered flute-like curved rim, the bottom merging into the side corrugations extending to the edge of the wall with a reverse curve providing an'upstandand fading out at a point above but adjacent 5 ing bead in the bottom adjacent the side wall, to the curve joining the side wall and bottom. 5

the bottom also having'a flat central portion and raised ribs tapering inwardly from the Add bead ROBERT E. RUTLEDGE. 

